I'm from Vienna - CoL compared to salaries here is pretty high but managable with social housing.

It's just that my friend working for a subsidiary of my employer in Zürich makes 3x as much, gets to keep a lot more of that money due to the significantly lower tax burden and then after that her CoL is ~2-2.5x what it is here.

Additionally, her salary is paid in CHF which is deflationary while I get my money in Eurozone Funbucks. As you might know, Austria has been a European inflation leader in the last 1-2 years (~10%).

Compared to the Swiss we are completely and utterly underpaid. For equivalent work and similar living conditions she's left with almost double the money at the end of the year. Note: We both do not live lavishly by any means.

Berlin, Munich and other big cities, where most of the tech jobs are, have had massive inflation over the last few years. There is a huge gap in terms of rents and mortgages between those who bought or signed a rental contract prior to 2021 and now. Meanwhile the strong CHF has led to Swiss inflation being somewhat lower. Kurzgesagt: German CoL is catching up but salaries remain behind.